variation

n. act or instance of varying; degree of diversity; change; modified version (as of a musical piece); deviation

Variation means an instance of change or the rate or magnitude of change. It may refer to: Biology:BiodiversityGenetic diversity, differences within a speciesPhysics:Magnetic variation, difference between magnetic north and true north, measured as an angleVariation (astronomy), any perturbation of the mean motion or orbit of a planet or satellite, particularly of the MoonMathematics:Bounded variationCalculus of variations, a field of mathematics which deals with functions of functions.Coefficient of variation in statistics, the magnitude of variance relative to the mean. Variation often refers to a vague notion of the extent of spread in measurements of a variable, quantified in the variance. Permutation
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n. variation, diversity, difference, change

n. variation, change, range, fluctuation

(n.)
The act of varying; a partial change in the form, position, state, or qualities of a thing; modification; alternation; mutation; diversity; deviation; as, a variation of color in different lights; a variation in size; variation of language.
  

(n.)
Repetition of a theme or melody with fanciful embellishments or modifications, in time, tune, or harmony, or sometimes change of key; the presentation of a musical thought in new and varied aspects, yet so that the essential features of the original shall still preserve their identity.
  

(n.)
One of the different arrangements which can be made of any number of quantities taking a certain number of them together.
  

(n.)
Extent to which a thing varies; amount of departure from a position or state; amount or rate of change.
  

(n.)
Change of termination of words, as in declension, conjugation, derivation, etc.